Nick Jonas took his older girlfriend bowling at Pinz bowling alley in Studio City, Calif. Aug. 2 and HollywoodLife.com has exclusive details that will make you swoon!

Nick Jonas may be a whopping eight years younger than his Australian pop star girlfriend, Delta Goodrem, but that doesn’t mean he’s out of touch when it comes to treating his girl like a queen. In fact, an eyewitness tells HollywoodLife.comNick, 18, was the perfect gentleman during a date with 26-year-old Delta at PINZ bowling alley in Studio City, Calif. Aug. 2.

“Nick is here a lot and he’s always a classy guy,” our source says. “He’s a really awesome bowler and definitely beat Delta, who wasn’t very good. But it was cute because he was trying to help teach her and make her a little better throughout the night.”

Apparently Nick and Delta — who’ve been dating since the spring — weren’t trying to hide their affection for each other, despite all the on-lookers at the bowling alley.

“Occasionally they’d give each other a little touch, or hold hands,” the eyewitness says. “They’d look at each other with goo goo eyes. Nick made sure to get all doors and was an extreme gentleman to her the entire night. He knows how to treat a lady.”

The couple was given plenty of privacy during their games, thanks to Nick’s bodyguard Big Rob, who didn’t let any fans take photos or ask for autographs while they were playing.

“Before and afterward Nick posed for a handful of pictures and signed autographs,” our source says. “Delta was friendly too and loved talking to the fans. Both of them are down to earth.”

Nick is currently in rehearsals for his role of Link Larkin in Hairspray at the Hollywood Bowl Aug. 5-7. Do YOU think Delta will be at all his shows?